Saudi Arabia on Saturday warned Israel against an offensive on the border city of Rafah in the Gaza Strip and called for the United Nations to hold an urgent meeting to head it off. Riyadh’s warning comes a day after Israeli Prime Minister Benjamin Netanyahu told the army to prepare for an offensive on Rafah, the last major city not taken over by Israeli forces. The Saudi Arabian Foreign Ministry warned of “very grave repercussions of storming and targeting Rafah,” calling the city the “last refuge” for hundreds of thousands of civilians. The oil-wealthy monarch called for the UN Security Coun…